/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.rpc.future;

import org.apache.dolphinscheduler.rpc.common.RpcRequest;
import org.apache.dolphinscheduler.rpc.common.RpcResponse;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

/**
 * RpcFuture
 */
public class RpcFuture implements Future<Object> {

  private CountDownLatch latch = new CountDownLatch(1);

  private RpcResponse response;

  private RpcRequest request;

  private long requestId;

  public RpcFuture(RpcRequest rpcRequest, long requestId) {
    this.request = rpcRequest;
    this.requestId = requestId;
  }

  @Override
  public boolean cancel(boolean mayInterruptIfRunning) {
    return false;
  }

  @Override
  public boolean isCancelled() {
    return false;
  }

  @Override
  public boolean isDone() {
    return false;
  }

  @Override
  public RpcResponse get() throws InterruptedException {
    // the timeout period should be defined by the business party
    boolean success = latch.await(5, TimeUnit.SECONDS);
    if (!success) {
      throw new RuntimeException("Timeout exception. Request id: " + this.requestId
          + ". Request class name: " + this.request.getClassName()
          + ". Request method: " + this.request.getMethodName());
    }
    return response;
  }

  @Override
  public RpcResponse get(long timeout, TimeUnit unit) throws InterruptedException {
    boolean success = latch.await(timeout, unit);
    if (!success) {
      throw new RuntimeException("Timeout exception. Request id: " + requestId
          + ". Request class name: " + this.request.getClassName()
          + ". Request method: " + this.request.getMethodName());
    }
    return response;
  }

  public void done(RpcResponse response) {
    this.response = response;
    latch.countDown();
  }
}
